I am only getting 1/2 the question right... problem is attached. Please help!

Question

amy2012 · Answer

attachment

harman.singh · Answer

Hey Amy, your answer is correct but incomplete. For this question, you should get two values for x. 

 x=121/2    &    x=...

harman.singh · Answer

Here is the quadratic formula:
$$x=\frac{ -b \pm \sqrt{b^2 -4ac} }{ 2a }$$
To get two x values, you would need to solve for both positive and negative square root as follow:
$$x=\frac{ -b+\sqrt{b^2 -4ac} }{ ?2a}$$

and...

$$x=\frac{ -b-\sqrt{b^2 -4ac} }{ ?2a}$$

harman.singh · Answer

For the '+ sqroot' equation (1st one) you would have got 121/2. You need to solve for the second equation to get the second x-value.